Crunch GP3000

mike49504 · 6th February 2011, 02:08 AM

Got another one of theese in for repair. I forget how do i tell which order the power supply drivers go in this amp since they were missing. A1275 C3228

Perry Babin · 6th February 2011, 04:09 AM

The PNP has its collector connected to ground.

mike49504 · 12th February 2011, 12:07 PM

Ok got another one of theese in the mail again. Heres what i have for gate signals for the fets wondering if theese look ok or not 1 side is different then the other.

Perry Babin · 12th February 2011, 12:57 PM

Those look OK but without the FETs in the circuit, it's difficult to know if the drive circuit is working properly.

mike49504 · 13th February 2011, 05:52 AM

Ok i put the fets back in new outputs new driver ic's.

When i try to power the amp up it goes into protection mode if i pull the output driverboard it powers up.

Any ideas what to check?

Perry Babin · 13th February 2011, 02:30 PM

Do you have the correct power supply voltage on each of the pads for the driver board?

mike49504 · 13th February 2011, 03:56 PM

with the driverboard removed heres what i have for voltages

1:0
2:0
3:-119.9
4:-108.4
5:-120.6
6: pulsing
7:-120.9
8:1.90
9:4.90
10:0
11:0
12:-4.90
13:0
14:14.90
15:-121.3
16: pulsing
17:-121.4
18:-109.4
19:-121.2
20:0
21:0

Perry Babin · 13th February 2011, 04:18 PM

Is the protect LED pulsing?

mike49504 · 13th February 2011, 04:20 PM

The driverboard is removed right now. Thats the voltages i have on the pads .

No amp powers up fine green light is one

Perry Babin · 13th February 2011, 04:37 PM

On the power supply driver board, is pin 1 or pin 7 pulsing?

6th February 2011, 02:08 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Crunch GP3000 Got another one of theese in for repair. I forget how do i tell which order the power supply drivers go in this amp since they were missing. A1275 C3228

6th February 2011, 04:09 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The PNP has its collector connected to ground. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th February 2011, 12:57 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Those look OK but without the FETs in the circuit, it's difficult to know if the drive circuit is working properly. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

13th February 2011, 02:30 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have the correct power supply voltage on each of the pads for the driver board? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

13th February 2011, 04:18 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the protect LED pulsing? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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13th February 2011, 05:52 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Ok i put the fets back in new outputs new driver ic's. When i try to power the amp up it goes into protection mode if i pull the output driverboard it powers up. Any ideas what to check?

13th February 2011, 03:56 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	with the driverboard removed heres what i have for voltages 1:0 2:0 3:-119.9 4:-108.4 5:-120.6 6: pulsing 7:-120.9 8:1.90 9:4.90 10:0 11:0 12:-4.90 13:0 14:14.90 15:-121.3 16: pulsing 17:-121.4 18:-109.4 19:-121.2 20:0 21:0

13th February 2011, 04:20 PM	#9
mike49504 diyAudio Member Join Date: Sep 2006	The driverboard is removed right now. Thats the voltages i have on the pads . No amp powers up fine green light is one

13th February 2011, 04:37 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	On the power supply driver board, is pin 1 or pin 7 pulsing? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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